<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var score=prompt("请您输入成绩")
			if(score>=90){
				alert("优秀")
			}else if(score>=80){
				alert("良好")
			}else if(score>=60){
				alert("及格")
			}else{
				alert("不及格")
			}
		</script>
	</body>
</html>
